1#ifndef __ASM_SH_PAGE_H
2#define __ASM_SH_PAGE_H
3
4/*
5 * Copyright (C) 1999  Niibe Yutaka
6 */
7
8/*
9   [ P0/U0 (virtual) ]		0x00000000     <------ User space
10   [ P1 (fixed)   cached ]	0x80000000     <------ Kernel space
11   [ P2 (fixed)  non-cachable]	0xA0000000     <------ Physical access
12   [ P3 (virtual) cached]	0xC0000000     <------ vmalloced area
13   [ P4 control   ]		0xE0000000
14 */
15
16#ifdef __KERNEL__
17
18/* PAGE_SHIFT determines the page size */
19#if defined(CONFIG_PAGE_SIZE_4KB)
20# define PAGE_SHIFT	12
21#elif defined(CONFIG_PAGE_SIZE_8KB)
22# define PAGE_SHIFT	13
23#elif defined(CONFIG_PAGE_SIZE_64KB)
24# define PAGE_SHIFT	16
25#else
26# error "Bogus kernel page size?"
27#endif
28
29#ifdef __ASSEMBLY__
30#define PAGE_SIZE	(1 << PAGE_SHIFT)
31#else
32#define PAGE_SIZE	(1UL << PAGE_SHIFT)
33#endif
34
35#define PAGE_MASK	(~(PAGE_SIZE-1))
36#define PTE_MASK	PAGE_MASK
37
38#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
39#define HPAGE_SHIFT	16
40#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
41#define HPAGE_SHIFT	18
42#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
43#define HPAGE_SHIFT	20
44#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
45#define HPAGE_SHIFT	22
46#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
47#define HPAGE_SHIFT	26
48#endif
49
50#ifdef CONFIG_HUGETLB_PAGE
51#define HPAGE_SIZE		(1UL << HPAGE_SHIFT)
52#define HPAGE_MASK		(~(HPAGE_SIZE-1))
53#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT-PAGE_SHIFT)
54#endif
55
56#ifndef __ASSEMBLY__
57
58extern void (*clear_page)(void *to);
59extern void (*copy_page)(void *to, void *from);
60
61extern unsigned long shm_align_mask;
62extern unsigned long max_low_pfn, min_low_pfn;
63
64#ifdef CONFIG_MMU
65extern void clear_page_slow(void *to);
66extern void copy_page_slow(void *to, void *from);
67#else
68extern void clear_page_nommu(void *to);
69extern void copy_page_nommu(void *to, void *from);
70#endif
71
72#if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
73	defined(CONFIG_SH7705_CACHE_32KB))
74struct page;
75extern void clear_user_page(void *to, unsigned long address, struct page *pg);
76extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
77extern void __clear_user_page(void *to, void *orig_to);
78extern void __copy_user_page(void *to, void *from, void *orig_to);
79#elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
80#define clear_user_page(page, vaddr, pg)	clear_page(page)
81#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
82#endif
83
84/*
85 * These are used to make use of C type-checking..
86 */
87#ifdef CONFIG_X2TLB
88typedef struct { unsigned long pte_low, pte_high; } pte_t;
89typedef struct { unsigned long long pgprot; } pgprot_t;
90#define pte_val(x) \
91	((x).pte_low | ((unsigned long long)(x).pte_high << 32))
92#define __pte(x) \
93	({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
94#else
95typedef struct { unsigned long pte_low; } pte_t;
96typedef struct { unsigned long pgprot; } pgprot_t;
97#define pte_val(x)	((x).pte_low)
98#define __pte(x) ((pte_t) { (x) } )
99#endif
100
101typedef struct { unsigned long pgd; } pgd_t;
102
103#define pgd_val(x)	((x).pgd)
104#define pgprot_val(x)	((x).pgprot)
105
106#define __pgd(x) ((pgd_t) { (x) } )
107#define __pgprot(x)	((pgprot_t) { (x) } )
108
109#endif /* !__ASSEMBLY__ */
110
111/* to align the pointer to the (next) page boundary */
112#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
113
114/*
115 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
116 *
117 *	arch/sh/kernel/vmlinux.lds.S
118 *
119 * which has the same constant encoded..
120 */
121
122#define __MEMORY_START		CONFIG_MEMORY_START
123#define __MEMORY_SIZE		CONFIG_MEMORY_SIZE
124
125#define PAGE_OFFSET		CONFIG_PAGE_OFFSET
126#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
127#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
128#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
129
130#define phys_to_page(phys)	(pfn_to_page(phys >> PAGE_SHIFT))
131#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
132
133/* PFN start number, because of __MEMORY_START */
134#define PFN_START		(__MEMORY_START >> PAGE_SHIFT)
135#define ARCH_PFN_OFFSET		(PFN_START)
136#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
137#define pfn_valid(pfn)		((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
138#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
139
140#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
141				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
142
143#include <asm-generic/memory_model.h>
144#include <asm-generic/page.h>
145
146/* vDSO support */
147#ifdef CONFIG_VSYSCALL
148#define __HAVE_ARCH_GATE_AREA
149#endif
150
151#endif /* __KERNEL__ */
152#endif /* __ASM_SH_PAGE_H */
153